snprintf() and _snprintf() are not equivalent.
Given the following program:
```
#include <stdio.h>
int main(){
char str[] = "0123456789";
_snprintf(str, 5, "%s", "-----");
puts(str);
}
```
A standard-conforming program should write a null terminator at str[4],
truncating the output to "----".
The Microsoft _snprintf() follows the semantics of strncpy(). That is, it does
not operate null terminated strings, but 'string fields'.
It overwrites the first five characters without appending a null terminator
(which would cause an overflow apparently), effectively outputting '-----56789'.
------------------
Best regards,
lh_mouse
2016-04-29
-------------------------------------------------------------
发件人：Hugo Beauzée-Luyssen <[email protected]>
发送日期：2016-04-29 17:09
收件人：mingw-w64-public
抄送：
主题：[Mingw-w64-public] [PATCH] crt: Add missing snprintf aliases
---
mingw-w64-crt/lib32/msvcr120_app.def.in | 1 +
mingw-w64-crt/lib64/msvcr120_app.def.in | 1 +
2 files changed, 2 insertions(+)
diff --git a/mingw-w64-crt/lib32/msvcr120_app.def.in
b/mingw-w64-crt/lib32/msvcr120_app.def.in
index 579edb3..bb1f214 100644
--- a/mingw-w64-crt/lib32/msvcr120_app.def.in
+++ b/mingw-w64-crt/lib32/msvcr120_app.def.in
@@ -1042,6 +1042,7 @@ _vscwprintf_p
_vscwprintf_p_l
_vsnprintf
vsnprintf == _vsnprintf
+snprintf == _snprintf
_vsnprintf_c
_vsnprintf_c_l
_vsnprintf_l
diff --git a/mingw-w64-crt/lib64/msvcr120_app.def.in
b/mingw-w64-crt/lib64/msvcr120_app.def.in
index 8c60b42..29aafba 100644
--- a/mingw-w64-crt/lib64/msvcr120_app.def.in
+++ b/mingw-w64-crt/lib64/msvcr120_app.def.in
@@ -984,6 +984,7 @@ _vscwprintf_p
_vscwprintf_p_l
_vsnprintf
vsnprintf == _vsnprintf
+snprintf == _snprintf
_vsnprintf_c
_vsnprintf_c_l
_vsnprintf_l
--
2.8.1
------------------------------------------------------------------------------
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your business applications. It resolves application problems quickly and
reduces your MTTR. Get your free trial!
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